Spray gun



May 4 1926.

s. F. ANDERsoN SPRAY GUN Filed No Patented May 44, 1926.

UNITED STATES PATENT OFFICE.

SWAN I'. ANDERSON, 0l' ROCKFORD, ILLINOIS, ASSIGNOR, BY IESNE ASBIGNKENTB, TO PEEBLESSPNEUMATIC SYSTEMS, INC., OF CHICAGO, ILLINOIS, A. CORPORATION 0l' ILLINOIS.

SPRAY GUN.

Application led November 11, 1922. Serial No. 600,941.

To all 'whom it lmay concern.: i

Be it known that I, SWAN F.` ANDERSON, a citizen of the United States, residing at Rockford, in the county of Winnebago and l State of Illinois, have lnvented certain new and useful Im rovements in Spray Guns, of

which the fol owing is a specification.

This invention pertains in general to air brushes or spray guns as they are common- 10 4ly known, fors relying aints, fillers, ename s, varnishes, sliel acs, yes, stains, bronzes, V aluminums, and in fact any liquid material which it is desired to spread on a surface for coating and finishing purposes.

The primary object of my invention is to provide a generally improved and simplified spray gun, characterized by` its economy in use of oth air and materials,- perfect atomization and ada tability for a wide range of 2 work, accessibi ity of parts requiring adjustment for different classes of work and which itis also desired to remove for cleaning and inspection, and by the simple and novel arrangement of parts which enables production at aV comparatively low cost.

In furtherance of the foregoing, my invention contem lates the fprovision of a spray gun having a ody pre erably in the form of a one-p1ece casting, havin a handle and a spray head portion joined y a barrel-like portion, giving ajvery simple, rigid and urable construction, with which the several eo-operatingparts may be organized in a very ellioient manner. Regarding the arrangement of parts, I have aimed to provide an air and a'l material delivery nozzle on the spray head, a needle valve for the materialdelivery means and air-supply valve for the air-delivery means in co-axial relation, and a trigger for operating both valves. By arran g these valves and `co-o erating parte in a plane below the barrel-l1ke portion of the body, an exceptionally simple construction is obtained, which promotes economy in the cost of manufacture, -enables accessibility to such parts as ma require attention either for adjustment, c eanin or repair, and `further'provides a we1lba anced spray gun capable of control to a fine degree of accuracy.

Still another object of my invention is to provide an improved nozzleconstruction of the llat spray type characterized by the novel manner in which the air-delivery nozzle iS associated with the material-delivery nozzle.

Other objects and attendant advanta es will be appreciated b those skilled in t is art as the invention comes better understood by reference tothe following descri tion when considered in connection with t e accompanying drawings, in which- Figure 1 1s a side elevation of a.spray gun embodying m invention;

Fig. 2 is a vertical longitudinal sectional view through the gun; and

F1 s. 3 and 4 are detail sections taken substantially on the lines 3--3 and 4 4, rcspectively, of Fig. 2. 0 Referring more particularly to the draw* ing, it wil be observed that the body on which the several co-operating parts are mounted, is in the form of a one-piece casting, shaped to provide a handle and a spray head portion 5 and 6 respectively, connected by an intermediate barrel-like ortion 7. Both the handlel and spray hea portions de end from the intermediate portion, provi ing a rigid framelwork or bod particularly well adapted for housing an carrying the several operating parts.

In the preferred construction, there is a material-supply passa 8 through the spray head 6 on a center low and parallel with the barrel-like portion 7. The liquid material to be atomized will be fed to this passa e 8 through a suitable hose not shown,

ut w ich ma be attached to the threaded nipple 9, whic has a passage 11 communieatin with the passage 8. The material may be fe through this means by gravity, pressure, siphon, or an other means for producing the required ow. The air pressure is admitted to the body through a hose connected to a suitable source of supply and attached preferably to a threaded nipple 12 on the handle portion 5, in which is formed an air-supply .passage 13 in alignment with the material-supply passa 8.

Upon the spray cad 6, ahave mounted a material-delivery nozzle and an air-delivery nozzle, designated generell b 14 and 15, respectively. The materiali-de ivery nozzle has an end l6threaded1y engaged in the sassag; 8, and a body portion 17, so shape as to readily en aged by a wrench for ti ening said nozz e in the spray head.

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nozzle has a central passage 18 communicating at one end with the passage 8 and terminating at its opposite end in a tapered delivery orifice 19, upon which the tapered end 20 of a needle valve 21 is adapted to seat for closin said delivery orifice. Said needle valve is adapted to be retracted by operation of a trigger 22 for opening said materialdelivery orifice 19, as will be more fully described hereinafter. The exterior of said nozzle body 14 tapers toward its delivery end and terminates in a cylindrical ti 23 the peripheral wall of which is for a ort distance parallel with the axis of the nozzle and forms the inner wall of a central airdelive orifice, the outer wall 24 of which is forme b the body of the air-delivery nozzle 15. is latter nozzle, it will be observed, forms a casing embracing the material-delivery nozzle 14. This casing defines the outer boundary and the nozzle 14, the` inner, of an air passage 25 which communioates with the central air-delivery orifice delined by the annular walls 23 and 24. The air delive nozzle is made up ofa coupling part 26 a a swivel part 27. Said coupling art is threadedly engaged on the spray ead 6, concentric wit t e nozzle 14, and said swivel scoping wit in the coupling part 27 and retained therein by an outwardly pressed or swaged ange 29. In this manner, the part 27 may be rotatably moved on the part 26, and at the same time an air-ti ht joint is provided between the relative?)7 movable parts. Said swivel part has diametrically opposed air passa s 31, which communicate at theirl inner en s with the air passa 25 and terminate at their outer ends in air-delivery orifices 32, which are adapted for delivering streams of air in converging planes for the purpose of producing in comination with the circular spray delivered through the central orifices, a fan or flat type spray. By rotative movement of the swivel part 27 on the coupling part 26, the major axis of the flat type spray, may be changed from horizontal to vertical, or to any angle. f Y

Air under pressure will be supplied to the passage 25, and consequently to the delivery orifice above mentioned, through an air-supply passage formed in the gun body and madeup of va vertical passage 33eommunieating with -the` air inlet passage 13, and

assages 34 and 35, the former extending ongitudinally through the barrel portion 7 A poppet type valve 36 urged by a compression spring 37 against a seat 38 normally closes the passage, and is adapted to be opened by rearward pressure of the trigger part 39 against the valve stem 41. A screw valve 42 regulates the How of air throu h the supply passage, as will be obvious. rom

lpart 27 has an inner end 28 teledrawing the trigger 22 rearwardly by linger action, the air-supply valve will be directly opened, thereby immediately supplying air to the central and intersecting air-delivery orifices..

Means is provided, whereby the trigger 22 operates the material-delivery valve, at present the needle valve 21, in addition to the air-supply valve 36. The needle valve will be opened subsequently to opening the airsupply valve, the oint of opening being regulated by an ad]ustment so that the interval between the opening of both `valves may be varied to suit the requirements, and if esired, both valves may be caused to open simultaneously. To this end a lost motion connection is provided between the trigger 22 and the needle valve 21, including an adjustment, whereby the lost motion ma be varied from zero to the maximum. It will be noted. that the needle valve passes through a stullingbox 43 in the inner end of the passage 18, and is threadedly en aged in its innerend 44 in a sleeve 45 sli able axially -in a lug 46 depending from the body portion 7, said studing box may be suitably constructed and is preferably shaped to receive a packing disposed around the needle valve and includes a threaded member, in this instance a acking gland having a knurled art a apted to be turned by the fingers or eomplressing the packing to prevent leakage of t e material around or passing from the passage 8. A cross head 47 fixed to the sleeve 45, has reduced ends 48 slidable in slots 49 in a yoke 51, which straddles the lug 46 and is pivotally attached by means of a pin 52 to the trigger 22. This trigger, it will be observed, has sides 53 straddlin the body portion 7 and pivotally attached t ereto by means of a pin 54. A coil compression spring 55 positioned between the body lug 46 and the cross head 47 urges the latter, and consequently the needle valve, in a direction to normally close said valve.

.With the parts in the position shown in Figs. 1 and 2, it will be evident that when the trigger 22 is drawn back by linger action, the air-sup ly valve 36 will be direct-l opened as ascribed above, and the needle valve 21 will remain closed until the yoke 51 moving with the trigger, has brought the end walls 56 of the slots 49 against the crosshead ends 48 which are fixed with respect to the needle valve. Upon continuing this trigger movement, the needle valve will be unseated, thereby delivering the material through the orifice 18 to be atomized by the action of the air. This relative timingY of the valves is desired in order that the initial stream of air may. blow away any foreign particles froni the surface to be sprayed, and also to insure thorou h atomization of the material the instant it issues from its rethe foregoing, it will-be evident that upon spective nozzle. Upon release of the trigioo ger, the valve will obviously be closed by action of the s rings 37 and 55. The timin of opening t e material-delivery valve wit res ct to the air-supply valve may be varie as conditions may require, by axial ad- 'ustment of the needle valve in the sleeve 45.

hat is, by screwing said needle valve in to said sleeve, the latter and consequently its cross head ends 48, will be advanced to the left viewing Fi 1, by the pressure of the spring 55, there y reducing the distance between said cross head ends and the end walls 56. Tol facilitate this adjustment, I have mounted a knurled disk 57 on the threaded end 44 of the needle valve stem, the openin in this disk being shaped to fit the attene sides 58 of said stein, so that the disk and stem will revolve to ether, but the disk may slide lengthwise on t e stem. By this means, the opening of the needle valve may bc uickly and easily adjusted with relation to t e opening of the air-supply valve.

It will be noted from t e foregoing that the air and material regulating valves are located in a common plane below the barrellke portion of the gun body. This enables a material reduction of the number of parts as compared with prior spray guns designed for similar work, and it follows that the cost of production is lowered not only because of the fewer number of parts involved, but also because of the alignment of the parts.

Another advantage of thisarrangement is that the needle valve adjustment is conveniently accessible and all of the parts which for any reason might require removal for cleaning, repair and inspection, are easil removable. It will also be noted that al adjustments and the changing of moving parts and different sizes of nozzles may be made without disconnecting the rmaterial hose. By means of the screw 42, the air pressure may be instantly regulated to suit the particular work at hand. In the event that spraying effects other than flat sprays are desired, the present nozzle will be removed and another of appropriate construction substituted therefor.

A further advantage of my invention is that the operative parts are so relatively arranged and the body of the gun so shaped that the arts requiring adjustment are exposed an in a freely accessible location so that it is not necessary to remove or disassembleimy of such operative parts in order to make the necessary adjustments. For example, the threaded member of the stuing box for the needle valve at the place the latter passes rearwardly from the material supply passage 8 is accessible at all times for ti htening the packing to prevent leakage. T e several operative parts have been so ornized and the body of the spray gun so s aped as to serve this purpose as one of the objects of the invention. In this regard the needle valve adjustment is also preferably located between said stutnng box and the trig er so as to be convenient y accessible at a times.

It is believed that the foregoing conveys a clear understanding of the objects prefaced above, and while I have illustrated but a single working embodiment, it should be understood that changes might be made in details of construction without departing from the spirit and scope of the invention as expressed in the appended claims:

I claim:

1. In a spray gun, in combination, a body having an air an a material-supply1 assage, a material-delivery nozzle on sai body in communication with the material-supply passage, and a dat s ray air-delivery nozzle concentric with sai material-delivery nozzle comprisin a coupling part and an air-delivery part, t e coupling part being threadedly connected to said body and bored to provide an air passage, the air-delivery part being mounted to swivel upon the cou ling part and being wholly supported an retained on the latter by the swivel connection, the air delivery part being shaped to provide the outer wall of an air passa e the inner wall of which is the materialelivery nozzle and which communicates with the firstmentioned air passage, and to provide an air dischar e orilice concentric with the discharge ori ce of the material-delivery nozzle, and to further provide opposed air-dclivery orifices communicating with said air assage and terminating in angular relation n or delivering converging streams of air intersecting the central material and air discharge.

2. A spray gun comprising, in combination, a bod having a nozzle end and a handle end an rovided with a material-supply passage in t e nozzle end and an air-supply passage in the handle end in axial alignment, a material-delivery nozzle and an air-delivery nozzle in coo erative relation on said nozzle end, a nee e valve for the material nozzle extending through and rearwardly beyond said material-supply passage, an air valve in the air-supply passage having a stem extending forwardly in axial alignment with the needle valve, a trigger pivoted on the body intermediate said needle valve and the air valve stem, a connection between said trigger and the air valve stem whereby the latter will be directly moved by rearward movement of the trigger, a lost-motion connection between said trigger and needle valve whereby the latter will be moved rearwardly by the trigger subsequently to the initial movement of the trigger, and adjustable means whereby .the o enmg of the needle valve with respect to t e air valve may be varied. Q

` passage in t 3. A spray gun comprising, in combiiiation, a bod havinga nozzle end and a handle end andI provided with a material-supply passage in the nozzle end and an air-supply passage in the handle end in axial alignment, a material-delivery nozzle and an air delivery nozzle in cooperative relation on said nozzle end, a needle valve for the material nozzle extending through and rearwardly beyond said material-supply passage, an air valve in the air-supply passage having a stem extending forwardly 1n axial alignment with the needle valve, a trigger pivoted on the body intermediate said needle valve and air valve stem, a connection between said trigger and air valve stem whereby the latter will be directly moved by rearward movement of the trigger, a yoke 'pivotally mounted to the trigger with its arms parallel with and straddling the rear end portion of the needle valve, `a sleeve threaded on said rear` end of the needle valve and having a crosshead the opposite en-ds of which have a lost-motion connection with the arms of said yoke, a coiled compression spring acting between said body and said sleeve to seat the needle valve, and means on the needle valve for turning it for purpose of adjustment.

4. A spray gun comprising, 1n combination, a bod having a nozzle end and a handle end an rovided with a material-supply llie nozzle end and an air-supply passage in the handle end in axial ali ment, amaterial-delivery nozzle and an air-delivery nozzle in cooperative relation on said nozzle end, a needle valve for the material nozzle extending through and rearwardly beyond said material-supply passage, an air valve in the air-supply passage aving a stem extending forwardly in axial alignment with the needle valve, a trigger pivoted on the body intermediate said needle valve and air valve stem, a connection between said tri er and air valve stem whereby the latter will be direct-ly moved by rearward movement of the trigger, a connection between the trigger and needle valve including a part threaded on the rear end of the needle valve, and means for turning the needle valve in said part for effecting relative adjustment between the opening of the air and needle valves.

5. A spray gun comprising, in combination, a body having a hand e and a head joined by a barrel portion, the headV having a material-supply passage beneath said harrel portion, the handle having an air-supply passage in axial alignment with said material-supply passage, a material-delivery nozzle on the head having a valve stem extending through and rearwardly beyond the material-supply passage, a packing between `said stem and then head at the rear end. of

said assage therein, a part threadedly engag with the head for compressing said Eackin around the valve stem, the bod enig s aped to expose saidpart so that 1t is accessib e for adjustment without disturbing any of the operative parts, an air-delivery nozzle on the head in cooperative relation with the material nozzle, an air passa e through the barrel portion connecting t e air passage in the handle with the air nozzle, a valve normally closing the airsupply passage, and a trigger ivoted on the barrel portion and connecte with said needle valve and air valve for operating them.

V6. A spray gun comprising, in combination, a body, a nozzle structure on one end of the body and a handle on the opposite end, the nozzle structure including a needle valve an-d a stuiing box through which the stem of the needle valve asses and extends rearwardly toward the iandle, a trigger mounted on the gun body intermediate the 'nozzle structure and handle and connected with the needle valve for unseating it, said body intermediate the nozzle structure and handle bein shaped to expose saidstuiling box so that it is accessible for tightening its packing around said valve stem without disassembling any of the operative parts.

7. A spray gun comprising, in combination, a body, a nozzle structure on one end of the body and a handle on tlhe opposite end, said nozzle structure includin a material delivery nozzle and a need e valve therefor, the stem of said needle valve extending rearwardly toward the handle, a trigger mounted on the body intermediate said nozzle structure and handle, and means whereby the needle valve will be unseated by theo eration of the4 trigger, including a threa ed connection with said valve stem and a part located between the trigger and said nozzle structure adapted for turning one of the threaded parts for eil'eeting adjustment of the needle valve with respect t0 the trigger. Y

8. A spray gun comprising,va body, a nozzle structure and a handle on opposite ends of the body, a trigger mounted on the bod intermediate said nozzle structure exten in rearwardly toward the handle, a yoke pivoted to the body and having a crossead with which the needle valve is connected, a com ression sprin inter osed between the bo y and said yo e un er a tension tending to seat the needle valve, a threaded connection between the needle valve and yoke, and a part slidable lengthwise on the needle valve and connected to rotate therewith for adjusting the needle valve in its threaded connection with the yoke.

9. A spray gun of the character described, including a body having a' nozzle structure and a handle at opposite ends and a tri ger therebetween, the nozzle structure inclu g a material delivery nozzle and an air nozzle and havinga needle valve for the material delivery nozzle extending rearwardly toward the trigger, an air supply valve in the handle end of the gun co-axial with the needle valve and having communication with the air nozzle and adapted to be unseated for delivering air thereto, said air valve extending forwardly toward the trigger, means whereby both the needle valve and air valve will be unseated by operation of the trigger, and a stu-iiin0r box for the needle valve located between t'he trigger and the nozzle structure, said rbody being so shaped that the stuliing box is accessible 101- tightening the packing around the needle valve without disturbing any of the operative parts of the Spray gun.

l0. A spray gun comprising, in combination, a barrel portion, a nozzle structure and a handle joined and held in relation by said barrel portion, a trigger pivoted on said body portion, a needle valve for said nozzle structure extending rearwardly therefrom in a plane parallel with and spaced from said barrel portion, a lug on said barrel portion extending across the plane of said needle valve, a compression spring bearing at one end against said lug and at its opposite end against the needle valve for seating the latter, and a connection between the trigger and needle valve for unseating the latter against pressure of said spring.

l1. A spray gun comprising in combination, a body portion, a nozzle structure and a handle joined and held in fixed relative relation by said bod portion, a trig er havmg spaced arms w ich straddle said body portion and are pivoted thereto, a needle valve for said nozzle structure in a lane parallel with and spaced from said lntermediate body portion and disposed between the spaced arms of the trigger, a cross-head on the needle valve, a compression spring on the needle valve operative between said body portion and said cross-head for seating said needle valve, and a connection between each trigger arm and the adjacent end of the cross-head for unseating the needle valve against the spring pressure.

12. A spray gun as set forth in claim 11, including an air valve in the handle end of the gun coaxial with the needle valve and adapted to be unseated by operation ofthe trigger, said body portion having an air passage extending longitudinally therethrough and providing communication between said air valve and the nozzle structure for delivering air to the latter.

13. A spray gun comprising, in combination, a body carrying a nozzle supporting head at one end and a handle at the opposite end, said head havingia material supply passage and said body having an air supply passage, a nozzle structure on said head in communication with said material and air supply passages, a needle valve for the nozzle passing through the material supply passage and beyond the same toward the handle, a triggepmounted on the body intermediate said head and handle and connected with said needle valve for unseating it, means preventing leakage of material from said material supply passage around or pasjthe needle valve including a packing an a stufling box therefor havin a threaded member adapted to be tightene to compress the packing about the needlelvalve, said body being shaped intermediate said head and handle to expose said threaded member so that it is accessible at will for compressing said packing without disturbing any of the operative parts of the spray gun.

SWAN F. ANDERSON.

ATTORNEYS terial delivery nozzle extending rearwardly toward the trigger, an air supply valve in the handle end of the gun co-axial with the needle valve and having communication with the air nozzle and adapted to be unseated for delivering air thereto, said air valve extending forwardly toward the trigger, means whereby both the needle valve and air valve will be unseated by operation of the trigger, and a stuffing box for the needle valve located between the trigger and the nozzle structure, said 'body being so shaped that the stuling box is accessible 101' tighteningr the packing around the needle valve without disturbing any of the operative parts of the spray gun.

10. A spray gun comprising, in combination, a barrel portion, a nozzle structure and a handle joined and held in relation by said barrel portion, a trigger pivoted on said body portion, a needle valve for said nozzle structure extending rearwardly therefrom in a plane parallel with and spaced from said barrel ortion, a lug on said barrel portion exten ing across the plane of said needle valve, a compression spring bearing ,at one end against said lug and at its opposite end against the needle valve for seatmg the latter, and a connection between the trigger and needle valve for unseating the latter against pressure of said spring.

11. A spray gun comprising in combination, a body portion, a nozzle structure and a handle joined and held in fixed relative relation by said bodv portion, a trigger havmg spaced arms which straddle said body portion and are pivoted thereto, a needle valve for said nozzle structure in a lane parallel with and spaced from said intermediate body portion and disposed between the spaced arms of the trigger, a cross-head on the needle valve, a compression spring on the needle valve operative between said body portion and said cross-head for seating said needle, valve, and a connection between each trigger arm and the adjacent end of the cross-head for unseating the needle valve against the spring pressure.

12. A spray gun as set forth in claim 11, including an air valve in the handle end of the gun coaxial with the needle valve and adapted to be unseated by operation ofthe trigger, said body portion having an air passage extending longitudinally therethrough and providing communication between said air valve and thc nozzle structure for delivering air to the latter.

13. A spray gun comprising, in combination, a body carrying a nozzle supporting head at one end and a handle at the opposite end, said head havinfr a material supply passage and said body having an air supply passage, a nozzle structure on said head in communication with said material and air supply passages, a needle valve for the nozzle passing through the material supply passage and beyond the same toward the handle, a triggenamounted on the body intermediate said head and handle and connected with said needle valve for unseating it, means preventing leakage of material from said material supply passage around or past the needle Valve including a packing and a stuting box therefor having a threaded member adapted to be tightened to compress the packing about the needlevalve, said body being shaped intermediate said head and handle to expose said threaded member so that it is accessible at will for compressing said packing without disturbing any of the operative parts of the spray gun.

SWAN F. ANDERSON.

A Certificate of Correction. y It is hereby certified that in Letters Patent No. 1,583,220, granted May 4, 1926, upon the application of SwanF. Anderson, of Rockford, Illinois, for an improvement in Spra correction vas fo ows: P

Guns, an error appears inthe printed specification requiring age 5, line 19, cla-im 10, before theword relation insert the word operative; andth-at the said Letters Patent should be read with this correction thereln that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 8th day of June, A. D. 1926.

[SEM-l M. J. MOORE, Actzng (/'ommssoner of Paten-ts.

Certicate of Correction.

It is hereby certified that in Letters Patent Np. 1,583,220, granted May 4, 1926, upon the application of Swan F. Anderson, of Rockford, Illinois, for an improvement in Spra Guns, an error appears in the printed specification requiring correction as fo ows: Page 5` line 19, claim 10, before theword relation insert the word operative; andih-at the said Letters Patent should be read with @his correotion therein that the same may conform to lche record of the case in the Patent Office.

Signed and sealed this 8th day of June, A. D. 1926.

[smh] M. J. MOORE,

Acting Commissioner of Patents. 

